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Identify the node representing a common ancestor with a sporophyte dominant lifestyle
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- Club mosses, horsetails, and ferns are ___ plants. a. multicelled aquatic b. nonvascular seed c. seedless vascular d. seed-bearing vascularThe following structures are found on the underside of fern leaves and contain sporangia: sori rhizomes megaphylls microphyllsCompared to vascular plants, bryophytes arc more easily harmed by environmental contaminants and add rain. Thus the diversity of these plants is sometimes used to assess pollution levels. What is it about the structure or function of a moss that would make it more susceptible to damage from air pollution than a horsetail or a cactus?
- e th aci st SJ I the size, shape, and arrangement of the leaves, which are microphylls, small leaves with only one vein. Examine the roots and their relationship to the stem. In Selaginella, the roots grow downward from a leaf-bearing stem. The sporangia of the Lycopodiophyta are borne on leaves essentially similar to the sterile leaves of the plant. The sporangium bearing leaf is called a sporophyll. In Selaginella and Lycopodium, the sporophylls occur in compact aggregates called cones, or strobili. 1. Label the microphylls and strobili in the Figure 1 below. Figure 1. Lycopodium sp. Examine the prepared slide of a mature Lycopodium strobilus. (See text Figure 17-16, pages 406 and 407.) Note that Lycopodium, like most species in the Lycopodiaceae, is homosporous and only produces one type of spore. iw ow del ain 2. Label the spores in Figure 2 below. qXI 92 Laibaquari Figure 2. Lycopodium strobilus l.s. 3. Given that Lycopodium is homosporous, would you expect its gametophytes to be…Both mosses and fernsA. have swimming spermB. have vascular tissueC. have leavesD. all of the above Fern sporangiaA. are located along the margins of phyllidsB. clusters are called soriC. produce spores by mitosisD. all of the aboveThe first flowering plants to diverge from the ancestral angiosperm are referred to as Omonocots O basal angiosperms O coniferophyta
- ecology and phylogeny of bryophytes, chlorophytes, diatoma, gymnosperms, horsetails, lycophytes, phaenophytes, rhodophytes, angiosperms, ferns and pinaphytes.The gametophyte of Pteridophytes is inconspicuous in comparison to the mosses. They are also commonly monecious (single "house", or thallus for male and female gamete production). The photo below shows a whole mount (w.m.) of a fern gametophyte at 40x. Make a sketch of the specimen and label the following structures: archegonium, antheridium, mature gametophyte (a.k.a. prothallus), rhizoids 90The following plants are heterosporous exceptmossesmonocotscycadsdicots
- Do mosses have an alteration of isomorphIC Or heteromorphic generations? That is, can youeasily tell a moss gametophyte from a moss sporophyte? When we look at leafy green mossplants, what are we seeing - gametophyte or the sporophyte? in a fiowering plant species,would the equivalent stage be the plant the pollen grains and megagametophytes(rather than herbaceous) in that the xylem often displays secondary growth (widening of the trunk). They generally have only tracheids for water conduction and lack vessel elements, which are characteristic of angiosperms. Tyino I. Division: Cycadophyta Although there is only about 100 extant species of cycads, this phylum was significant during the Triassic period (248 million years ago). They are tropical and subtropical plants with trunk-like stems and compound leaves and are popular as ornamentals. These plants are dioecious in that seed cones and pollen cones are on two separate plants. Because of their palm-like structure, they are sometimes incorrectly described as palm trees. However, like other gymnosperms they produce cones and lack flowers. Examples of cycads include False king sago and Florida coontie (Zamia pumila). Zamia pumila is the only cycad native to the United States. ACTIVITY 1: Examine the live plant and/or cones if available. (Use the atlas if necessary.) olsmot…acrial sporophyte collumella hydroids alternation of generation antheridium lеptoid liverworts perine layer pscudo-claters rhizoids cuticle hornworts elaters intercalary sporophyte mosses leafy gametophyte archegonium oil bodies gemmae stomates 18 19 20 14 11 10 13 12 16 15 5. 4
